Add DOD ruleset (#148)

Author: Fabtron

docs/pull_request_template.md

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+### How to test?
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+
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+### Definition of Done
+
+- [ ] Changelog gepflegt
+- [ ] Dokumentation gepflegt
+- [ ] Alle Anforderung des Issues sind erfüllt
+- [ ] Selbst greviewed _(aka [Self-Reviews (eng)](https://www.nerdwallet.com/blog/engineering/why-you-should-be-doing-self-reviews/))_
+- [ ] Review mit Product Owner _(Release-Variante o. Minified Build)_
+
+- App Tests
+  - [ ] Minified getestet? _(aka. Release Build)_
+  - [ ] Environements beachtet _(Production/Staging)_
+  - [ ] Unterstützte Sprachen sind getestet
+  - [ ] Light-/Dark-Mode getestet
+  - [ ] Edge-Cases getestet
+  - [ ] Android API Levels wurden berücksichtigt _(minSdk?)_
+
+- Testing
+  - [ ] Tests geschrieben _(aka Unit-Tests, Integration-Tests)_
+  - [ ] Tests lokal laufen gelassen